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r PENNSYLVANIA.

Laim Paten: No. 74,500, 'dazed February A18, 186s.

IMPROVEMENT IN PUMPS.

TO ALL WHOM ITV MAY CONCERN:

Beit known that we, TAYLOR CHAMBERLIN and T. ELwooD GARRETT, ot Philadelphia, in the county of Philadelphia, and State of Pennsylvania, -have invented a new and useful Improvement Pumps; and we do hereby declare that the following is a full, clear, and exact description thereof, which will enable those skilled in the art to mnke and use the same, reference being had to the accorvnpanying drawings, forming part of this specification.

This invention relates to a new and improved method of constructing pumps, whereby they are greatly simplified in their parts, and rendered more durable than pumps oi" ordinary construction; and the invention consists in a hollow shafta-nd piston, and in the `manner in which the cylinder is constructed, and the water discharged therefrom, as will be hereinafter described.

Figure 1 represents an outside view of the pump complete;

Figure 2 is a cross-section through the line :c :z: of iig. 1.

Figure 3 is a longitudinal section of g. 2, through the line yy.'

Similar letters of reference indicate Vcorresponding parte.

Thispump is cylindrical in form, and it is operated by oscillating a hollow piston ou a hollow'shaft within the cylinder, and forcing the water, by such action of the piston, through valves into a discharge-chamber.

A is the cylinder, which is cast with an abutment section in it, which section forms the discharge-chamber,

and is marked B. C is the shaft. D is the piston, which is caston the shaft. The form of the hollow shaft` and piston is seen in iig. 3.` The water enters the pump through the hollow shaft, and having free access to the hollow piston, it is forced through the cylinderv into the discharge-chamber, by the oscillating motion given the piston by the lcvcr E. F-rcpresents the discharge-orice, to which the hose or discharge-pipe is attached. The ,water is received into and discharged frm the same side of the pump. G is the cylinder-head for the discharge side, and II is thehead for the opposite side of the cylinder. This head, H, of the cylinder is packed, so as to prevent leakage around the shaft, as'seen in the drawing, and 4packing may be used within thecylinder, if desired, or found necessary., A

It will be noticed that the outer central portion of the diseharge-chamber forms aeb'earing and guide for the shaft at a. c c indicate valves onthe piston, and al d indicate valves within the discharge-chamber B. As seen in the drawing, the piston is moving in the direction of the arrows, and forcing water Vinto the chamber B, by the valve cl. While the piston is thus passing, water is entering the piston 'through the hollowshaft, and filling the other side of the cylinder, so that, when the motionof the piston isV reversed, the valve e will open,

and e will be closed, while d, in the chamber, .will be opened, and cl will close. J J indicate plates or ears on the cylinder, by which the pump is bolted down.

We do not`coniine ourselves to the use of packing in the cylinder, or on the headsofvthe cylinder, nor to any particular kinds of metal, of which to form the pump, or parts of the pump; but, having thus described our invention, i

What we claimas new, and desire to secure by Letters Patent, is-

1. Thevhollow shaft andvpiston, C D, arranged andoperating sbstantiallyas shown and described;

2; The combination of the hollow piston and shaft: C D, the discharge-chamber B, and the cylinder A, aubstantially as and for-the purposes specified. i

TAYLOR GHAMBEELIN,

T. ELWOOD GARRETT. Witncssesz- ROBERT HU'rcHINsoN, JOHN M. CARSON. 

